The United Kingdom consists of Great Britain, Northern Ireland, and smaller islands, with England, Scotland, Wales, and Northern Ireland as the four countries. It has a population of around 65 million and is governed as a unitary parliamentary constitutional monarchy, with Queen Elizabeth II as head of state and Theresa May as Prime Minister. Culturally, the UK is known for the works of writers like Shakespeare and Conan Doyle as well as the musical group The Beatles.